EPOR and breast neoplasm: A study comparing several commercially available EPO‐R antibodies suggested that the M‐20 clone (sc‐697, Santa Cruz Biotechnology) was the only antibody suitable for detection of the EPO‐R protein by western blot known to date (Elliott et al. 2006), although the same group recently reported that, in a breast tumor cell line (MCF‐7), the M‐20 antibody also bound to a nonspecific protein migrating at a similar molecular weight as the EPO‐R (Elliott et al. 2013).